Fiber optic telephone line extension system
First Claim
Patent Images
1. An apparatus for providing telephone communication between a communication network and a remote station, said apparatus comprising:
- a base modem for communicative connection to said communication network;
a remote modem for direct communicative connection to a first user instrument at said remote station; and
a fiber optic link connecting said base modem to said remote modem such that telephone communication between said communication network and said first user instrument is provided via said fiber optic link, said fiber optic link being transparent to said communication network and said first user instrument;
wherein said remote modem provides a first two-way communication path between said first user instrument and the fiber optic link, said remote modem including;
a first telephone interface for direct communicative connection to said first user instrument and for emulating the communication network to said first user instrument;
a fiber optic controller/driver for transmitting and receiving digitally modulated signals over said fiber optic link;
first audio processing means connected between said first telephone interface and said fiber optic controller/driver such thata first audio signal received from said first user instrument by said first telephone interface is converted to a first digitally modulated signal by modulation means in said first audio processing means and transmitted to said fiber optic link by said fiber optic controller/driver, anda second digitally modulated signal received from said fiber optic link by said fiber optic controller/driver is converted to a second user audio signal by demodulation means in said first audio processing means and transmitted to said first user instrument by said first telephone interface, the modulation means and demodulation means each receiving clock signals from said fiber optic controller/driver;
separate paths within said first two-way communication path for a ring logic and an off-hook logic wherein said fiber optic controller/driver facilitates the transmission of said ring and off-hook logic in separate digital channels over the fiber optic link;
a ring generator for generating a ring signal to said first user instrument;
a relay for connecting said first user instrument to either said first telephone interface or said ring generator; and
a ring circuit forresponding to the ring logic from said fiber optic controller/driver by causing the relay to connect the first user instrument to said ring generator, andresponding to an off-hook condition received from said first user instrument by causing the relay to connect the first user instrument to the first telephone interface and causing the off-hook logic to be transmitted to said fiber optic controller/driver.
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Abstract
Apparatus far providing telephone communication between a communication network and a remote station employs base and remote modems and a fiber optic communication link connecting the modems. The apparatus operates transparently to the communication network and user instruments at the remote site. Each modem includes audio signal processing equipment. The base modem employs an interface for emulating a user instrument to the network, and the remote modem employs an interface for emulating a network to a user instrument. The remote modem directly connects to a user instrument at the remote site.
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Citations
37 Claims
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1. An apparatus for providing telephone communication between a communication network and a remote station, said apparatus comprising:
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a base modem for communicative connection to said communication network; a remote modem for direct communicative connection to a first user instrument at said remote station; and a fiber optic link connecting said base modem to said remote modem such that telephone communication between said communication network and said first user instrument is provided via said fiber optic link, said fiber optic link being transparent to said communication network and said first user instrument; wherein said remote modem provides a first two-way communication path between said first user instrument and the fiber optic link, said remote modem including; a first telephone interface for direct communicative connection to said first user instrument and for emulating the communication network to said first user instrument; a fiber optic controller/driver for transmitting and receiving digitally modulated signals over said fiber optic link; first audio processing means connected between said first telephone interface and said fiber optic controller/driver such that a first audio signal received from said first user instrument by said first telephone interface is converted to a first digitally modulated signal by modulation means in said first audio processing means and transmitted to said fiber optic link by said fiber optic controller/driver, and a second digitally modulated signal received from said fiber optic link by said fiber optic controller/driver is converted to a second user audio signal by demodulation means in said first audio processing means and transmitted to said first user instrument by said first telephone interface, the modulation means and demodulation means each receiving clock signals from said fiber optic controller/driver; separate paths within said first two-way communication path for a ring logic and an off-hook logic wherein said fiber optic controller/driver facilitates the transmission of said ring and off-hook logic in separate digital channels over the fiber optic link; a ring generator for generating a ring signal to said first user instrument; a relay for connecting said first user instrument to either said first telephone interface or said ring generator; and a ring circuit for responding to the ring logic from said fiber optic controller/driver by causing the relay to connect the first user instrument to said ring generator, and responding to an off-hook condition received from said first user instrument by causing the relay to connect the first user instrument to the first telephone interface and causing the off-hook logic to be transmitted to said fiber optic controller/driver. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. A remote modem for use with a first user instrument, said remote modem providing a first two-way communication path between said first user instrument and a fiber optic link, said remote modem comprising:
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a first telephone interface for direct communicative connection to said first user instrument and for emulating communication network to said first user instrument; a fiber optic controller/driver for transmitting and receiving modulated signals over a single fiber optic strand of said fiber optic link; first audio processing means connected between said first telephone interface and said fiber optic controller/driver such that a first user audio signal received from said first user instrument by said first telephone interface is converted to a first modulated signal by modulation means in said first audio processing means and transmitted to said fiber optic link by said fiber optic controller/driver, said first modulated signal comprising a first digital data stream, and a second modulated signal comprising a second digital data stream and received from said fiber optic link by said fiber optic controller/driver is converted to a second user audio signal by demodulation means in said first audio processing means and transmitted to said first user instrument by said first telephone interface; and
wherein;said modulation means and demodulation means each receive clock signals from said fiber optic controller/driver; said remote modem further comprises a first filter, connected to said modulation means, for bandlimiting said first user audio signal prior to conversion to said second modulated signal; said remote modem further comprises a second filter, connected to said demodulation means, for bandlimiting said second user audio signal subsequent to conversion from said first modulated signal; said first two-way communication path includes separate paths for a ring logic and an off-hook logic and wherein said fiber optic controller/driver facilitates the transmission of said ring and off-hook logic in separate digital channels over the single fiber optic strand; said remote modem further comprises a ring generator for generating a ring signal to said first user instrument; said remote modem further comprises a relay for connecting said first user instrument to either said first telephone interface or said ring generator; said remote modem further comprises a ring circuit for responding to a ring logic from said fiber optic controller/driver by causing the relay to connect the first user instrument to said ring generator, and responding to an off-hook condition received from said first user instrument by causing the relay to connect the first user instrument to the first telephone interface and causing an off-hook logic to be transmitted to said fiber optic controller/driver; and said fiber optic controller/driver includes a combined light emitting diode/detector for providing full-duplex communication over the single fiber optic strand. - View Dependent Claims (26, 27)
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28. A remote modem for use with first and second user instruments, said remote modem providing a first two-way communication path between said first user instrument and a fiber optic link, said remote modem providing a second two-way communication path between said second user instrument and the fiber optic link, said remote modem comprising:
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a first telephone interface for direct communicative connection to said first user instrument and for emulating a communication network to the first user instrument; a second telephone interface for direct communicative connection to said second user instrument and for emulating the communication network to the second user instrument; a fiber optic controller/driver for transmitting and receiving modulated signals over a single fiber optic strand of said fiber optic link, said first and second two-way communication paths each including separate paths for a ring logic signal and an off-hook logic signal and wherein said fiber optic controller/driver facilitates the transmission of the ring logic signals and said off-hook logic signals in separate digital channels over the single fiber optic strand; first audio processing means connected between said first telephone interface and said fiber optic controller/driver such that a first user audio signal received from said first user instrument by said first telephone interface is converted to a first modulated signal by said first audio processing means and transmitted to said fiber optic link by said fiber optic controller/driver, said first modulated signal comprising a first digital data stream, and a second modulated signal comprising a second digital data stream received from said fiber optic link by said fiber optic controller/driver is converted to a second user audio signal by said first audio processing means and transmitted to said first user instrument by said first telephone interface; second audio processing means connected between said second telephone interface and said fiber optic controller/driver such that a third user audio signal received from said second user instrument by said second telephone interface is converted to a third modulated signal by said second audio processing means and transmitted to said fiber optic link by said fiber optic controller/driver, and a fourth modulated signal received from said fiber optic link by said fiber optic controller/driver is converted to a fourth user audio signal by said second audio processing means and transmitted to said second user instrument by said second telephone interface; a shared ring generator for providing a ring signal to both the first and second user instruments in response to the respective ring logic signals; first and second relays for connecting each user instrument to either its respective telephone interface or said shared ring generator; and first and second ring circuits for responding to a respective ring logic signal from said fiber optic controller/driver by causing the respective relay to connect the respective user instrument to the shared ring generator.
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29. A remote modem for use with a first user instrument, said remote modem providing a first two-way communication path between said first user instrument and a fiber optic link, said remote modem comprising:
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a first telephone interface for direct communicative connection to said first user instrument and for emulating a communication network to said first user instrument; a fiber optic controller/driver for transmitting and receiving digitally modulated signals over said fiber optic link; first audio processing means connected between said first telephone interface and said fiber optic controller/driver such that a first audio signal received from said first user instrument by said first telephone interface is converted to a first digitally modulated signal by modulation means in said first audio processing means and transmitted to said fiber optic link by said fiber optic controller/driver, and a second digitally modulated signal received from said fiber optic link by said fiber optic controller/driver is converted to a second user audio signal by demodulation means in said first audio processing means and transmitted to said first user instrument by said first telephone interface, the modulation means and demodulation means each receiving clock signals from said fiber optic controller/driver; separate paths within said first two-way communication path for a ring logic and an off-hook logic wherein said fiber optic controller/driver facilitates the transmission of said ring and off-hook logic in separate digital channels over the fiber optic link; a ring generator for generating a ring signal to said first user instrument; a relay for connecting said first user instrument to either said first telephone interface or said ring generator; and a ring circuit for responding to the ring logic from said fiber optic controller/driver by causing the relay to connect the first user instrument to said ring generator, and responding to an off-hook condition received from said first user instrument by causing the relay to connect the first user instrument to the first telephone interface and causing the off-hook logic to be transmitted to said fiber optic controller/driver. - View Dependent Claims (30, 31, 32, 33, 34, 35, 36, 37)
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Specification